Mimus polyglotktos mi·mus·po·lyglotktos uncommon noun 1. long-tailed gray-and-white songbird of the southern United States able to mimic songs of other birds SynonymsmockingbirdmockerMimus polyglotktos Related words Broader terms oscine Parts Mimus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.